/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/GeometryCollectionClusteringUtility.h
Node E has no geometry of its own, only a transform by which to control A & B as a single unitIndexof the New Node
static int32 ClusterBonesUnderNewNode ( [FGeometryCollection](API\Runtime\Chaos\GeometryCollection\FGeometryCollection) * GeometryCollection, const int32 InsertAtIndex, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & SelectedBones, bool CalcNewLocalTransform, bool Validate )